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Let \( A \) and \( B \) are two points outside a circle \( S \) such that the chord of contact from \( A \) to \( S \) passes through \( B \). If the length of tangent from \( A \) to \( S \) is \( l_{1} \) and length of tangent from \( B \) to \( S \) is \( l_{2} \), then length of \( A B \) is
(a) \( \sqrt{l_{1}^{2}+l_{2}^{2}} \)
(b) \( \sqrt{l_{1}^{2}+l_{2}^{2}+l_{1} l_{2}} \)
(c) \( l_{1}+l_{2} \)
(d) \( \left|l_{1}-l_{2}\right| \)
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